atc.c

ATMEL公司的AT91RM9200芯片在嵌入式系统中应用非常多

	/*
	 * Burst Read. (Offset 8 in UPMA RAM)
	 */
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	/*
	 * Single Write. (Offset 18 in UPMA RAM)
	 */
	0xfffec00, 0xfffac00, 0xfff2d00, 0xfef2800, 
	0xfaf2080, 0xfaf2080, 0xfaf2400, 0x1fbf6c05, /* last */
	/*
	 * Burst Write. (Offset 20 in UPMA RAM)
	 */
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	/*
	 * Refresh  (Offset 30 in UPMA RAM)
	 */
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	/*
	 * Exception. (Offset 3c in UPMA RAM)
	 */
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
};												
																	
/* ------------------------------------------------------------------------- */

/* Check Board Identity:
 */
int checkboard (void)
{
	printf ("Board: ATC\n");
	return 0;
}

/* ------------------------------------------------------------------------- */

/* Try SDRAM initialization with P/LSDMR=sdmr and ORx=orx
 *
 * This routine performs standard 8260 initialization sequence
 * and calculates the available memory size. It may be called
 * several times to try different SDRAM configurations on both
 * 60x and local buses.
 */
static long int try_init (volatile memctl8260_t * memctl, ulong sdmr,
			  ulong orx, volatile uchar * base)
{
	volatile uchar c = 0xff;
	ulong cnt, val;
	volatile ulong *addr;
	volatile uint *sdmr_ptr;
	volatile uint *orx_ptr;
	int i;
	ulong save[32];		/* to make test non-destructive */
	ulong maxsize;

	/* We must be able to test a location outsize the maximum legal size
	 * to find out THAT we are outside; but this address still has to be
	 * mapped by the controller. That means, that the initial mapping has
	 * to be (at least) twice as large as the maximum expected size.
	 */
	maxsize = (1 + (~orx | 0x7fff)) / 2;

	/* Since CFG_SDRAM_BASE is always 0 (??), we assume that
	 * we are configuring CS1 if base != 0
	 */
	sdmr_ptr = &memctl->memc_psdmr;
	orx_ptr = &memctl->memc_or2;

	*orx_ptr = orx;

	/*
	 * Quote from 8260 UM (10.4.2 SDRAM Power-On Initialization, 10-35):
	 *
	 * "At system reset, initialization software must set up the
	 *  programmable parameters in the memory controller banks registers
	 *  (ORx, BRx, P/LSDMR). After all memory parameters are configured,
	 *  system software should execute the following initialization sequence
	 *  for each SDRAM device.
	 *
	 *  1. Issue a PRECHARGE-ALL-BANKS command
	 *  2. Issue eight CBR REFRESH commands
	 *  3. Issue a MODE-SET command to initialize the mode register
	 *
	 *  The initial commands are executed by setting P/LSDMR[OP] and
	 *  accessing the SDRAM with a single-byte transaction."
	 *
	 * The appropriate BRx/ORx registers have already been set when we
	 * get here. The SDRAM can be accessed at the address CFG_SDRAM_BASE.
	 */

	*sdmr_ptr = sdmr | PSDMR_OP_PREA;
	*base = c;

	*sdmr_ptr = sdmr | PSDMR_OP_CBRR;
	for (i = 0; i < 8; i++)
		*base = c;

	*sdmr_ptr = sdmr | PSDMR_OP_MRW;
	*(base + CFG_MRS_OFFS) = c;	/* setting MR on address lines */

	*sdmr_ptr = sdmr | PSDMR_OP_NORM | PSDMR_RFEN;
	*base = c;

	/*
	 * Check memory range for valid RAM. A simple memory test determines
	 * the actually available RAM size between addresses `base' and
	 * `base + maxsize'. Some (not all) hardware errors are detected:
	 * - short between address lines
	 * - short between data lines
	 */
	i = 0;
	for (cnt = maxsize / sizeof (long); cnt > 0; cnt >>= 1) {
		addr = (volatile ulong *) base + cnt;	/* pointer arith! */
		save[i++] = *addr;
		*addr = ~cnt;
	}

	addr = (volatile ulong *) base;
	save[i] = *addr;
	*addr = 0;

	if ((val = *addr) != 0) {
		*addr = save[i];
		return (0);
	}

	for (cnt = 1; cnt <= maxsize / sizeof (long); cnt <<= 1) {
		addr = (volatile ulong *) base + cnt;	/* pointer arith! */
		val = *addr;
		*addr = save[--i];
		if (val != ~cnt) {
			/* Write the actual size to ORx
			 */
			*orx_ptr = orx | ~(cnt * sizeof (long) - 1);
			return (cnt * sizeof (long));
		}
	}
	return (maxsize);
}

int misc_init_r(void)
{
	volatile immap_t *immap = (immap_t *) CFG_IMMR;
	volatile memctl8260_t *memctl = &immap->im_memctl;
	
	upmconfig(UPMA, (uint *)rtc_table, sizeof(rtc_table) / sizeof(uint));
	memctl->memc_mamr = MxMR_RLFx_6X | MxMR_WLFx_6X | MxMR_OP_NORM;	

	return (0);
}
			
long int initdram (int board_type)
{
	volatile immap_t *immap = (immap_t *) CFG_IMMR;
	volatile memctl8260_t *memctl = &immap->im_memctl;

#ifndef CFG_RAMBOOT
	ulong size8, size9;
#endif
	long psize;

	psize = 8 * 1024 * 1024;

	memctl->memc_mptpr = CFG_MPTPR;
	memctl->memc_psrt = CFG_PSRT;

#ifndef CFG_RAMBOOT
	/* 60x SDRAM setup:
	 */
	size8 = try_init (memctl, CFG_PSDMR_8COL, CFG_OR2_8COL,
			  (uchar *) CFG_SDRAM_BASE);
	size9 = try_init (memctl, CFG_PSDMR_9COL, CFG_OR2_9COL,
			  (uchar *) CFG_SDRAM_BASE);

	if (size8 < size9) {
		psize = size9;
		printf ("(60x:9COL) ");
	} else {
		psize = try_init (memctl, CFG_PSDMR_8COL, CFG_OR2_8COL,
				  (uchar *) CFG_SDRAM_BASE);
		printf ("(60x:8COL) ");
	}

#endif	/* CFG_RAMBOOT */

	icache_enable ();

	return (psize);
}

#if (CONFIG_COMMANDS & CFG_CMD_DOC)
extern void doc_probe (ulong physadr);
void doc_init (void)
{
	doc_probe (CFG_DOC_BASE);
}
#endif

#ifdef	CONFIG_PCI
struct pci_controller hose;

extern void pci_mpc8250_init(struct pci_controller *);

void pci_init_board(void)
{
	pci_mpc8250_init(&hose);
}
#endif